Imaging apparatus, imaging method, and non-transitory computer-readable medium for obtaining a high resolution image in at least two different modes

1. An imaging apparatus comprising: an imager including an imaging sensor configured to acquire an optical image of a subject; and a processor comprising hardware, the processor being configured to: perform pixel displacement to displace a positional relationship between the subject and the imager in a unit of less than a pixel pitch; detect an amount and a direction of a shake; perform shake correction to correct the positional relationship between the subject and the imager based on a detection result of the amount and the direction of the shake; perform first imaging for a first predetermined number of times for each position of the pixel displacement to generate a first group of images; combine the images of the first group to generate a first high-resolution image; perform second imaging for a second predetermined number of times for each position of the pixel displacement to generate a second group of images, the second predetermined number of times being greater than the first predetermined number of times; and combine the images of the second group to generate a second high-resolution image, wherein the processor is further configured to switch between the first imaging and the second imaging, wherein the processor is configured to switch between the first imaging and the second imaging in response to an input of a user, and wherein the processor is configured to cause a display to display a prohibition warning and a recommendation warning simultaneously based on the detection result of the amount and the direction of the shake, the prohibition warning being a warning of prohibiting one or both of the first imaging and the second imaging, the recommendation warning being a warning of, when one of the first imaging and the second imaging is prohibited, performing another imaging of the first imaging and the second imaging, the other imaging being not prohibited.

2. The imaging apparatus according to claim 1 , wherein the processor is configured to switch between the first imaging and the second imaging based on the detection result of the amount and the direction of the shake.

3. The imaging apparatus according to claim 1 , wherein the processor allows the first imaging that generates the images of the first group and the second imaging that generates the images of the second group to be performed alternatively and continuously, and is configured to perform at least one of the combining the images of the first group to generate the first high-resolution image and the combining the images of the second group to generate the second high-resolution image.

4. The imaging apparatus according to claim 1 , wherein the processor is configured to perform the first imaging while holding the shake correction.

5. The imaging apparatus according to claim 1 , wherein the processor is configured to change the second predetermined number based on the detection result of the amount and the direction of the shake.

6. An imaging apparatus comprising: an imager including an imaging sensor configured to acquire an optical image of a subject; and a processor comprising hardware, the processor being configured to: perform pixel displacement to displace a positional relationship between the subject and the imager in a unit of less than a pixel pitch; detect an amount and a direction of a shake; perform shake correction to correct the positional relationship between the subject and the imager based on a detection result of the amount and the direction of the shake; perform first imaging for a first predetermined number of times for each position of the pixel displacement to generate a first group of images; combine the images of the first group to generate a first high-resolution image; perform second imaging for a second predetermined number of times for each position of the pixel displacement to generate a second group of images, the second predetermined number of times being greater than the first predetermined number of times; and combine the images of the second group to generate a second high-resolution image, wherein based on the detection result of the amount and the direction of the shake, the processor is configured to reduce the number of times the pixel displacement is performed in the second imaging to perform imaging so as to reduce a series of drive times for continuous capture as the amount of the shake is greater; and/or the processor is configured to increase the number of times of imaging for the pixel displacement in the second imaging as the amount of the shake is greater.

7. An imaging apparatus comprising: an imager including an imaging sensor configured to acquire an optical image of a subject; a shutter configured to adjust exposure time; and a processor comprising hardware, the processor being configured to: perform pixel displacement to displace a positional relationship between the subject and the imager in a unit of less than a pixel pitch; detect an amount and a direction of a shake; perform shake correction to correct the positional relationship between the subject and the imager based on a detection result of the amount and the direction of the shake; perform first imaging for a first predetermined number of times for each position of the pixel displacement to generate a first group of images; combine the images of the first group to generate a first high-resolution image; perform second imaging for a second predetermined number of times for each position of the pixel displacement to generate a second group of images, the second predetermined number of times being greater than the first predetermined number of times; combine the images of the second group to generate a second high-resolution image; and limit, based on the detected amount of the shake, a lower limit value of a shutter speed in the second imaging such that a value of the shutter speed at which an amount of the shake becomes the pixel displacement or less is set by the shake correction.

8. An imaging apparatus comprising: an imager including an imaging sensor configured to acquire an optical image of a subject; a flash controller including a plurality of flash emission modes; and a processor comprising hardware, the processor being configured to: perform pixel displacement to displace a positional relationship between the subject and the imager in a unit of less than a pixel pitch; detect an amount and a direction of a shake; perform shake correction to correct the positional relationship between the subject and the imager based on a detection result of the amount and the direction of the shake; perform first imaging for a first predetermined number of times for each position of the pixel displacement to generate a first group of images; combine the images of the first group to generate a first high-resolution image; perform second imaging for a second predetermined number of times for each position of the pixel displacement to generate a second group of images, the second predetermined number of times being greater than the first predetermined number of times; combine the images of the second group to generate a second high-resolution image, wherein when the flash controller does not prohibit the flash, the processor is configured to control the flash to perform a manual emission control with a same light emission intensity as an initial light emission intensity for the pixel displacement in the first imaging or in the second imaging except for a flash emission at an initial pixel displacement.

9. The imaging apparatus according to claim 1 , wherein the processor provides a delay time between an input of an instruction for starting imaging and start of the imaging in the second imaging.

10. The imaging apparatus according to claim 1 , wherein the processor is configured to detect image shifting in the unit of the pixel pitch or less in the images of the second group with respect to a reference image, cause the imaging sensor to perform the pixel displacement at a 0.5 pixel pitch to generate image data, and combine images that are obtained by shifting the generated image data in a unit of 1 pixel pitch to perform a position corrections.

11. A method of imaging, the method comprising: performing pixel displacement to displace a positional relationship between a subject and an imager in a unit of less than a pixel pitch; detecting an amount and a direction of a shake; performing shake correction to correct the positional relationship between the subject and the imager based on a detection result of the amount and the direction of the shake; and performing at least one of first high-resolution image generating process and second high-resolution image generating process, the first high-resolution image generating process including performing first imaging for a first predetermined number of times for each position of the pixel displacement to generate a first group of images, and combining the images of the first group to generate a first high-resolution image, the second high-resolution image generating process including performing second imaging for a second predetermined number of times for each position of the pixel displacement to generate a second group of images, and combining the images of the second group to generate a second high-resolution image, the second predetermined number of times being greater than the first predetermined number of times, wherein based on the detection result of the amount and the direction of the shake, the processor is configured to reduce the number of times the pixel displacement is performed in the second imaging to perform imaging so as to reduce a series of drive times for continuous capture as the amount of the shake is greater; and/or the processor is configured to increase the number of times of imaging for the pixel displacement in the second imaging as the amount of the shake is greater.

12. A non-transitory computer-readable recording medium on which a program for imaging is recorded, the program instructing a processor to execute: performing pixel displacement to displace a positional relationship between a subject and an imager in a unit of less than a pixel pitch; detecting an amount and a direction of a shake; performing shake correction to correct the positional relationship between the subject and the imager based on a detection result of the amount and the direction of the shake; and performing at least one of first high-resolution image generating process and second high-resolution image generating process, the first high-resolution image generating process including performing first imaging for a first predetermined number of times for each position of the pixel displacement to generate a first group of images, combining the images of the first group to generate a first high-resolution image, the second high-resolution image generating process including performing second imaging for a second predetermined number of times for each position of the pixel displacement to generate a second group of images, and combining the images of the second group to generate a second high-resolution image, the second predetermined number of times being greater than the first predetermined number of times, wherein based on the detection result of the amount and the direction of the shake, the processor is configured to reduce the number of times the pixel displacement is performed in the second imaging to perform imaging so as to reduce a series of drive times for continuous capture as the amount of the shake is greater; and/or the processor is configured to increase the number of times of imaging for the pixel displacement in the second imaging as the amount of the shake is greater.

13. The imaging apparatus according to claim 1 , wherein the first imaging is a tripod high resolution capture, and the second imaging is a handheld high resolution capture.

14. The imaging apparatus according to claim 13 , wherein the processor is further configured to automatically select one of the tripod high resolution capture and the handheld high resolution capture based on a determination of whether or not a shake amount exceeds a threshold.

15. The imaging apparatus according to claim 1 , wherein both the first imaging and the second imaging perform at least eight displacements, some of the at least eight displacements being at least one pixel and one other of the at least eight displacements being less than one pixel.